Swap preamps output cables left to right and see if the noise changes with it. If yes, you narrowed the problem to just the preamp. Try tube replacement to further narrow the problem to the tubes (or eliminate them from the list).
Hissing sound from right speaker
I fired up the system last night and began listening to a LP that sounded like it had horrible surface noise. Upon investigation, it was not the LP, but a loud hissing noise coming from the preamp. When I muted the preamp, the sound went away. By changing input selector (LP, CD, etc.) there was no change. It is a Klyne pre plugged into a PS Audio 300 power supply.
Any thoughts on how to trouble shoot this issue?
Any thoughts on how to trouble shoot this issue?